Really nice game! The core mechanic of deck-building is one of my favourites, and I think you nailed it. The cards are enough to offer a good variety of option; the balancing is not perfect, but I know it's notably the hardest part in making this type of games.
It was a bit hard, at first, because the player has too many choices in building the deck. However, that's a pretty impressive result for a three day game jam. Congratulations!